Lamp-socket.



lNo. 875,357. PATENTED DEG'. 31, 1907,

W. R. LAMBERT. LAMP SOCKET.

APPLIOATION FILED FEB. l. 1907.

-Lu/en for.

- n -l y Md/.Ml H l@ n gq. 25 I mm proved device from below.

WALTER REGINALD LAMBERT, OF LONDON, ENGLAND.

LAMP-SOCKET.

Specification of Letters Patent.

Patented Dec. 31, 1907.

y, Application led February l. 1907 Serial No. 355.303.

To all whom it may concern:

Be it known that I, WALTER lRitenaiirm LAMBERT, a subject of the King of Great Britain and Ireland, residing at 28 Avington Grove, London, SE. in the county ofLondon,

England, have invented certain new and useful im rovenients in Lamp-Sockets, of whichv the Yfol owing is a specification, reference behad therein to the accompanying drawings.

This invention relates to electric lamp sockets and provides with the same. a lamp -holder constructed in two principal portions,

such lampholder being adapted to enable ready connection and disconnection of the lamp, and at the same time to' prevent, when in use, the percolation of any moisture or Ylluid from the outside to the interior part of said holder and connections containing the contactmembers, one of the portions of the lamp holder being adapted to be cemented or otherwise herinelically connected with the tions, and can also, with due precaution as to' the prcportiiming of the parts, be used under water.

This invention is hereinafter described with reference to the accompanying drawings in \.\'ii :h:-

lfigure 1 is a longitudinal `sectional elevation ol' the improved holder. Fig. 2 isa plan vier.' ot' the same. Fig. 3 is a View f the imN Fig. 4 is a side view ol the lower portion ot the base of the lamp. Fig. .5 is a plan View ot the part shown in Fig. 4 with the bulb removed. Fig. 6 is a view ol' the part shown in Fig.' 4, from below. Fig. T is aside elevation of the gasket einployed as apacking between the base and the holder. Fig. Sis a transverse section on the line B--S ol Fig. l.

'lhe improved device comprises a base 1 leaving a cylindrical extension 1 at one side :1nd spaced wings 32 and 32 extending from the cylindrical portion 1, and a rib 25 cx.

tending from the base 1 between the wings The base portion, cylindrical portion, spaced wings, horseshoe shaped guard, andt e rib, are preferably constructed of one single piece ot porcelain or other suitable insulating material. with spaced threaded apertures 26, 27 to receive holding screws whereby the device may be secured in place to a supporting structure when required.

Fitting within'the cylindrical portion 1 is a threaded sleeve 8, preferably pressed or spun from sheet metal in the usual manner, and with inwardly extending lugs 20, 21 bearing upon the :Hoor or base 1. Connecting the lugs 20, 21, is a bridge member 22, the latter secured to the base 1 by a threaded clamp bolt 23 having means at its threaded end within the space between the wings 32, 32', such as clamp nuts 24, for securing one of the lead wires in the usual manner.

Disposed within the horseshoe shaped guard 16 1s a spring contact 17 having its outer whirl extended and connected to the base 1 within the sleeve 8 by a clamp screw 18, this clamp screw having means, such as a nut 19, for connecting another of the lead wires to the bolt within thespace between the wings 32, 32'.'

it will be noted that the bolts 18 and 23, together with their binding nuts 19 and 24, are disposed onopposite sides of the rib 25,y

point is obviated.

The bulb 4 of an incandescence lamp is adapted to be cemented into or otherwise so that all danger of short-circuiting at this Vhernietically fastened at the edge 3 within the upper cup-shaped ortion 2 of the lamp base. The male meta screw thread 7 can then be screwed Within the corresponding metal female thread 8 in the interior of the external socket portion 1 and finally comd pressing the gasket 9 of rubber or other equivalent elastic material so as to establish a watertight joint between the edges 1U and 11.

One lead of the lamp is connected with the central contact 12, while the other is connected with the metal screw thread 7 before referred to. During the/screwing into position the contact 12 vpresses down vupon the contact surface 14 lof the spring 17 mounted the other side, and with a horseshoe sha ed upon the floor 15 ofthe external socket 1,

guard 16 extending from the base 1 wit in l within the horseshoe shaped insulating guard The rib 25 is provided 16, and connected up with the terminal 18 and thence to the external terminal screw 19 in the base of the portion 1.

With regard to the other terminal the current passes, when the holder is in the screwed down position,-irom the screw thread 7 to the screw thread 8 and so to the lugs 20, 21, on the floor 15 of the portion 1, whence it is carried by the bridge piece 22 to the terminal 23, and so to the external terminal screw 24 in the base of the portion 1.

The conductors of the circuit are brought into the channels 28 in the portion 1, so that the screws 1Q and 24 canbe thrust within the coiled strands oi the wires and binding washers screwed on. The space between the ribs 32, 32 forming the channel 28 is then filled in with insulating composition of the usual -kind preferably at boilingr trinpei'ature.

The screw thread 8 does not extend to the level of the edge ll'of the socketv 1, and similarly the screw thread 7 does not extend to the crown 29, The screw thread 8 is also preferably cut away considerably as at 30 to prevent accidentalcontact with the conductor 17l or terminal `18, and this feature also incidentally facilitates the introduction of the metal lining into the socket. lThe rim of the portion 2 is preferably milled as shown at 31 to afford purchase 'for the fingers when screwing in the lamp socket.` Fig. 7 shows a chamfered form to which the gasket 9 may be cut or punched.`

The wing extensions 32-32 ofthe ortion 1 are, in the manner as shown, prefere ly eX- 'tended considerably to either side to obtain the advantage of embedding the conductors in insulating composition for some distance,

whereby is not only the areal theinsulation increased and the percolation of moisture to the conductors eiiectually prevented, but by being more iirmly held the conductors are I less prone to dislodgment in handling, with consequent liability to leakage of current.

As regards the disconnectible members of the circuit this invention provides for the ef- I A lamp socket, a base ol non-conducting material comprising a body having spaced wings at one side and a socket at the other side and with a semi-annular guard rib eX- tending from the body within thel socket and a longitudinal rib between said wings, a spring Contact extending within thc semiannular guard rib and provided at its outer end with a binding bolt passing through the body, a threaded sleeve of conductive material within said socket and provided with inwardly extending lugs, a segmental bridge member connected at the ends tov said lugs and provided with a bolt passing through the body, said bolts being disposed upon oppoeA site sides of said longitudinal guard rib, and means for connecting the conducting wires respectively to said bolts, plastic insulating material disosed between said wings and around said ongitudinal guard ril In testimony whereof I ailx my .signature inthe presence of two witnesses.

WALTER RllGlNALll LAMBERT. Witnesses:

G. L. BROwNE, F. L. RAND. 

